1. The sequence of different amino acids in the polypeptide chain of a protein is called its :   Quaternary structure   primary structure   tertiary structure   secondary structure   Hint Half-n-half Clue   2. Which of the following is not an aromatic amino acid ?   Phenylalanine   Tryptophan   Tyrosine   Serine   Half-n-half Clue   3. Which of the following amino acids is polar ?   Leucine   Histidine   Isoleucine   Valine   Half-n-half Clue   4. The Quaternary structure of a protein is :   its amino acid sequence   its structure resulting from hydrogen bonds between the C=O and N-H groups of different amino acids.   its structure resulting from interactions between amino acid side chains.   its structure resulting from the union of more than one protein molecule, called subunit proteins.   Half-n-half Clue   5. Which of the following is not a type of protein secondary structure ?   third level folding to form small globules   â-pleated sheet   á-helix   Turns   Half-n-half Clue   6. Successive amino acids in the polypeptide chains that make up a protein are held together by :   phosphodiester bonds   interprotamine disulfide bonds   peptide bonds   N-glycosidic bonds   Half-n-half Clue   7. How many different amino acids are found in proteins ?   30   27   infinite   20   Half-n-half Clue